circulation feed water heater

例句：

1. 1.The new circulation feed water heater has improved the efficiency of the heating system.
   新型的循环给水热水器提高了供热系统的效率。
2. 2. The circulating water in the circulation feed water heater helps to keep the temperature constant.
   循环给水热水器中的循环水有助于保持温度恒定。
3. 3.The circulation feed water heater is designed to provide hot water for domestic use.
   循环给水热水器设计用于提供家用热水。